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synapse/contrib/docker/README.md

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Synapse Docker

This Docker image will run Synapse as a single process. It does not provide any database server or TURN server that you should run separately.

If you run a Postgres server, you should simply have it in the same Compose project or set the proper environment variables and the image will automatically use that server.

Build

Build the docker image with the docker build command from the root of the synapse repository.

docker build -t matrixdotorg/synapse .

The -t option sets the image tag. Official images are tagged matrixdotorg/synapse:<version> where <version> is the same as the release tag in the synapse git repository.

You may have a local Python wheel cache available, in which case copy the relevant packages in the cache/ directory at the root of the project.

Run

It is recommended that you use Docker Compose to run your containers, including this image and a Postgres server. A sample docker-compose.yml is provided, including example labels for reverse proxying and other artifacts.

Then, to run the server:

docker-compose up -d

In the case you specify a custom path for you configuration file and wish to generate a fresh homeserver.yaml, simply run:

docker-compose run --rm -e SYNAPSE_SERVER_NAME=my.matrix.host synapse generate

If you do not wish to use Compose, you may still run this image using plain Docker commands. Note that the following is just a guideline and you may need to add parameters to the docker run command to account for the network situation with your postgres database.

docker run \
    -d \
    --name synapse \
    -v ${DATA_PATH}:/data \
    -e SYNAPSE_SERVER_NAME=my.matrix.host \
    matrixdotorg/synapse:latest

Volumes

The image expects a single volume, located at /data, that will hold:

  • temporary files during uploads;
  • uploaded media and thumbnails;
  • the SQLite database if you do not configure postgres;
  • the appservices configuration.

You are free to use separate volumes depending on storage endpoints at your disposal. For instance, /data/media coud be stored on a large but low performance hdd storage while other files could be stored on high performance endpoints.

In order to setup an application service, simply create an appservices directory in the data volume and write the application service Yaml configuration file there. Multiple application services are supported.

Environment

Unless you specify a custom path for the configuration file, a very generic file will be generated, based on the following environment settings. These are a good starting point for setting up your own deployment.

Global settings:

  • UID, the user id Synapse will run as [default 991]
  • GID, the group id Synapse will run as [default 991]
  • SYNAPSE_CONFIG_PATH, path to a custom config file

If SYNAPSE_CONFIG_PATH is set, you should generate a configuration file then customize it manually. No other environment variable is required.

Otherwise, a dynamic configuration file will be used. The following environment variables are available for configuration:

  • SYNAPSE_SERVER_NAME (mandatory), the current server public hostname.
  • SYNAPSE_REPORT_STATS, (mandatory, yes or not), enable anonymous statistics reporting back to the Matrix project which helps us to get funding.
  • SYNAPSE_NO_TLS, set this variable to disable TLS in Synapse (use this if you run your own TLS-capable reverse proxy).
  • SYNAPSE_WEB_CLIENT, set this variable to enable the embedded Web client.
  • SYNAPSE_ENABLE_REGISTRATION, set this variable to enable registration on the Synapse instance.
  • SYNAPSE_ALLOW_GUEST, set this variable to allow guest joining this server.
  • SYNAPSE_EVENT_CACHE_SIZE, the event cache size [default 10K].
  • SYNAPSE_CACHE_FACTOR, the cache factor [default 0.5].
  • SYNAPSE_RECAPTCHA_PUBLIC_KEY, set this variable to the recaptcha public key in order to enable recaptcha upon registration.
  • SYNAPSE_RECAPTCHA_PRIVATE_KEY, set this variable to the recaptcha private key in order to enable recaptcha upon registration.
  • SYNAPSE_TURN_URIS, set this variable to the coma-separated list of TURN uris to enable TURN for this homeserver.
  • SYNAPSE_TURN_SECRET, set this to the TURN shared secret if required.

Shared secrets, that will be initialized to random values if not set:

  • SYNAPSE_REGISTRATION_SHARED_SECRET, secret for registrering users if registration is disable.
  • SYNAPSE_MACAROON_SECRET_KEY, secret for Macaroon.

Database specific values (will use SQLite if not set):

  • POSTGRES_DATABASE - The database name for the synapse postgres database. [default: matrix]
  • POSTGRES_HOST - The host of the postgres database if you wish to use postgresql instead of sqlite3. [default: db which is useful when using a container on the same docker network in a compose file where the postgres service is called db]
  • POSTGRES_PASSWORD - The password for the synapse postgres database. If this is set then postgres will be used instead of sqlite3. [default: none] NOTE: You are highly encouraged to use postgresql! Please use the compose file to make it easier to deploy.
  • POSTGRES_USER - The user for the synapse postgres database. [default: matrix]